Tire-building machine



June 10, 1930/ J. VRBANAC 1,762,850

TIRE BUILDING MACHINE Filed April 4, 1927 JoHN VRBANAC /NVENT0R o A'r-ro NeY Patented June 10, '1930 UNITED STATES,

PATENT F-FICE- I JOHN vmanunc, F MILWAUKEE, WISCONSIN, A sIeNoRI'ro THEIIFISK RUBBER'COM1 PANY, or CHICOIPEE FALLS, MASSAGHUSETTS A coRroRATIo or MASSACHUSETTS TIRE-BUILDING MACHINE Application filed April 4, 192?. Seria1'N'o. 180,8 52. Y

My invention relates to machines for building pneuamtio tire casings and more particularly to an improved roll for apply.- ing strips of material to the tire carcass while 5 the latter is supported on a revolving core or former.

The main object of my invention is to pro vide a roll which will apply the mate-rial evenly and without wrinkles over the curved surface of thecore. Other and further objects will be apparent from the following specification and claims. 1

In the accompanying drawings which illustrate one embodiment of my invention,

Figure 1 is a longitudinal section of my improved roll, I

Figure 2 is a view showing the manner in which the roll operates and,

Figure 3 is a diagrammatic view showing a roll of the priorart.

In the manufacture of tire casings itis customary to form the tire on a core of substantially tire shape, the carcass material being Shaped about the core and certain parts such as chafing strips and side wall rubber applied in strip form, either as a unit or as separate strips, to the sides of the carcass on the core. This has heretofore been accomplished by the use of a roll such as is shown at a in Figure 3, the roll being shaped to fit the curvature of the core. This has proved unsatisfactory for the reason that the roll being of varying diameters the circumferential speed varied resulting in-a slipping and dragging action over parts'of the carcass, producing either wrinkles or an uneven stretch in parts of the material applied. 7 I find that these objectionable features may be overcome by so constructing the applying roll that the diameterof the roll is substantially uniform or uniformly tapered, but at the same time capable of conforming to the shape of the core.

This is accomplished by using a coiled spring 1 held between end plates 2 and 3 threaded to a bearing 4 which is freely rotatable on a shaft 5. The bearing member lis held in position on its shaft in any suitable manner as by shoulder 6rformed on the shaft and nut 7 and washer 8." The ends of the spring-l may be secured to the plates 2 and 3bywelding or otherwise and in large sized twoior three coils of the spring, adjacent the end plates, together. s

' As shown in Figure 2, when the roll is pressed in operative position against the tire carcass 9, supported on rotatable core 10, for the purpose of applying a strip of material such as is'indicated at 11, the spring conforms to the shape of the tire. The distortedroll, however, maintains its diameter and,

rolls it may be advantageous to weldthe first.

when the core is set in motion rotates about I the phantom center 12l2, the circumferential speed of all parts of the roll being uniform. The strip 11 is therefore smoothly applied with minimum distortion. A further advantage is that the same roll may be used for various shapes and sizes of cores. VVhereas'it was previously necessary to keep on hand as many rolls as was necessary for maximum production, of a shape corresponding to both shape and size of the various types of tiresto be built, the numberof different shapes and Sizes in many cases being twenty or more, withothe roll of my invention three standard sizes are found 'sufiicient for the entire rangefof shapes and sizes.

Furthermore, the prior art rollswere quickly worn out due to the fact that there was substantial friction between parts of the roll and the core, while the roll invention lasts indefinitely;

I claim: 1. A roll for applying material 'to the curved surface of a tire casing comprising,

of my a coiled spring confined between end plates, 7

the end plates and spring being mounted for free rotation. I v r 2. A roll for applying material to the curved surface of a tire casing comprising,

spaced end members,'means to maintain said i 7 members in spaced relation, and a coiled sprlng of substantially uniform dlameter conbetween the discs to form a distortable roll.

4. A roll for applying material to the curved surface of a tire casing comprising a rotatable bearing member, discs secured to the ends of said member and a coiled spring coufined between the discs, the ends of the spring being secured to said discs. i

5. A roll for applying material to the curved surface of a tire casing comprising a rotatable bearing member, discs secured to the ends 01": said member and a coiled spring confined between the discs to form a distortable roll.

6. A roll for applying material to the curved surface of a tire casing comprising a rotatable bearing member, discs secured to the ends of said member and a coiled spring confined between the discs, the ends of the spring being secured to said discs and the coils of the spring immediately adjacent the ends being secured to each other.

In testimony whereof I have signed my 7 name to the above specification.

JOHN VRBANAC. 

